vance/ryujinx
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Use a basic cubic interpolation for the audren upsampler (#3129)

Browse Source 
Before, it was selecting nearest neighbour, which sounded terrible. This is likely temporary til the upsampling algorithm used by the switch is reversed.

Fixes bad audio in Skyward Sword HD.
This commit is contained in:
riperiperi 2022-02-17 19:19:29 +00:00 committed by GitHub
parent 741db8e43d
commit 7e9011673b
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 28 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
Ryujinx.Audio/Renderer/Dsp/ResamplerHelper.cs
View File

@ -600,19 +600,42 @@ namespace Ryujinx.Audio.Renderer.Dsp
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void ResampleForUpsampler(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer, float ratio, ref float fraction, int sampleCount)
{
// TODO: use a bandwidth filter to have better resampling.
// Currently a simple cubic interpolation, assuming duplicated values at edges.
// TODO: Discover and use algorithm that the switch uses.
int inputBufferIndex = 0;
int maxIndex = inputBuffer.Length - 1;
int cubicEnd = inputBuffer.Length - 3;
for (int i = 0; i < sampleCount; i++)
{
float outputData = inputBuffer[inputBufferIndex];
float s0, s1, s2, s3;
if (fraction > 1.0f)
s1 = inputBuffer[inputBufferIndex];
if (inputBufferIndex == 0 || inputBufferIndex > cubicEnd)
{
outputData = inputBuffer[inputBufferIndex + 1];
// Clamp interplation values at the ends of the input buffer.
s0 = inputBuffer[Math.Max(0, inputBufferIndex - 1)];
s2 = inputBuffer[Math.Min(maxIndex, inputBufferIndex + 1)];
s3 = inputBuffer[Math.Min(maxIndex, inputBufferIndex + 2)];
}
else
{
s0 = inputBuffer[inputBufferIndex - 1];
s2 = inputBuffer[inputBufferIndex + 1];
s3 = inputBuffer[inputBufferIndex + 2];
}
outputBuffer[i] = outputData;
float a = s3 - s2 - s0 + s1;
float b = s0 - s1 - a;
float c = s2 - s0;
float d = s1;
float f2 = fraction * fraction;
float f3 = f2 * fraction;
outputBuffer[i] = a * f3 + b * f2 + c * fraction + d;
fraction += ratio;
inputBufferIndex += (int)MathF.Truncate(fraction);